diff --git a/src/adapters/sonobi.js b/src/adapters/sonobi.js
index f923d979f99..cca84bb8829 100644
--- a/src/adapters/sonobi.js
+++ b/src/adapters/sonobi.js
@@ -12,7 +12,7 @@ var SonobiAdapter = function SonobiAdapter(){
     var adSlots = request.bids || [];
     var bidderRequestId = request.bidderRequestId;
     var ref = (window.frameElement) ? '&ref=' + encodeURI(top.location.host || document.referrer) : '';
-    adloader.loadScript(trinity + JSON.stringify(_keymaker(adSlots)) + '&cv=' + _operator(bidderRequestId) + ref );
+    adloader.loadScript(trinity + JSON.stringify(_keymaker(adSlots)) + '&cv=' + _operator(bidderRequestId) + ref);
   }
 
   function _keymaker(adSlots){
@@ -23,11 +23,15 @@ var SonobiAdapter = function SonobiAdapter(){
         var floor = (bidRequest.params.floor) ? bidRequest.params.floor : null;
         //  Mandatory
         var slotIdentifier = (bidRequest.params.ad_unit) ? bidRequest.params.ad_unit : (bidRequest.params.placement_id) ? bidRequest.params.placement_id : null;
-        var sizes = utils.parseSizesInput(bidRequest.sizes).toString() || null;
-        var bidId = bidRequest.bidId;
+        var sizes = (bidRequest.params.sizes) ? bidRequest.params.sizes : bidRequest.sizes || null;
+        sizes = utils.parseSizesInput(sizes).toString();
+        
         if (utils.isEmpty(sizes)){
           utils.logError('Sonobi adapter expects sizes for ' + bidRequest.placementCode);
         }
+
+        var bidId = bidRequest.bidId;
+
         var args = (sizes) ? ((floor) ? (sizes + '|f=' + floor) : (sizes)) : (floor) ? ('f=' + floor) : '';
         if (/^[\/]?[\d]+[[\/].+[\/]?]?$/.test(slotIdentifier)){
           slotIdentifier = slotIdentifier.charAt(0) === '/' ? slotIdentifier : '/' + slotIdentifier;
@@ -100,11 +104,11 @@ var SonobiAdapter = function SonobiAdapter(){
   }
 
   return {
-    callBids:    _phone_in,
-    formRequest: _keymaker,
+    callBids:       _phone_in,
+    formRequest:    _keymaker,
     parseResponse:  _trinity,
-    success: _success,
-    failure: _failure
+    success:        _success,
+    failure:        _failure
   };
 };
 
diff --git a/test/spec/adapters/sonobi_spec.js b/test/spec/adapters/sonobi_spec.js
index 9a8c3f0a11a..ca0cd6735ee 100644
--- a/test/spec/adapters/sonobi_spec.js
+++ b/test/spec/adapters/sonobi_spec.js
@@ -60,6 +60,19 @@ describe('Sonobi adapter tests', () => {
       }
     }]
   };
+
+  const adUnit_as = {
+    code: 'sbi_s',
+    sizes: [[120, 600], [300, 600], [160, 600]],
+    bids: [{
+      bidder: 'sonobi',
+      params: {
+        ad_unit: '/7780971/sparks_prebid_LB',
+        sizes: [[300, 250], [300, 600]]
+      }
+    }]
+  };
+
   const adUnit_ad = {
     bidderCode: 'sonobi',
     bids: [{
@@ -227,6 +240,7 @@ describe('Sonobi adapter tests', () => {
     'adUnit_pd' : adUnit_pd,
     'adUnit_pdf' : adUnit_pdf,
     'adUnit_a' : adUnit_a,
+    'adUnit_as' : adUnit_as,
     'adUnit_ad' : adUnit_ad,
     'adUnit_af' : adUnit_af,
     'adUnit_adf' : adUnit_adf,